High-frequency screen



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HARRY E. KELLER, OF BURNE-', TEXAS.

HGl--FREQUENGY SCREEN'.

appiieanoa and nel@ 1e, 192i. serial no. ir/e394.

To all whom it may concern.:

Bc' it known that l, Hanny H. KELLER, a citizen of the United States, residing at Burnet, in the county oi" Burnet and State oi'i Texas, have invented certain new and useiul Improvements in High Frequency `Screens, ot which .the ifollowing is a specification.

rllhi-s invention relates to an improvement in sitting screens, being particularly directed to the mounting ot a multiple decir screen on supports capable et high frequency vibration under suitable power application, the mounting of the screens being such as to insure their movement in a true horizontal rectilinear motion to thereby avoid tl e objectionable arc motion ordinarily incident in the suspended type et' screen or in that type supported on vertical springs.

The invention contemplates the `mounting of the screens in multiple deck form as a unit, as for example7 connected to a single frame member, and the supporting oi this unit on a single point of suspension from cables, wires, rods, or other elements connected to a fixture above and below the point of support and capable of being tensioned to a desired extent both above and below the point of support. Thedisturbing force is applied at right angles to the axis of support, so that each point of support, and therefore each point throughout the screen structure, will lmove in a straightline in the same direction, insuring a true horizontal rectilinear motion of the entire unit.

A particularly important feature of the construction, in addition to eliminating the objectionable arc motion of suspended or spring supported screens, is that the present structure avoids the necessity tor and provision oi any bearings or bearing surfaces whatever.

In the drawings:

Fig. l is a view in side elevation illustrating'the invention. y

Fig. 2 is an end elevation of the same.

Fig. 3 is a View showing the invention applied to a sealping screen.

The improved screen structure comprises a frame made up ott opposed side pieces l, of substantially rectangular shape between which the screens 2 are arranged in superimposed oppositely inclined relation. The screens are rigidly secured by means of the frame members l to provide afrigid screen unit, and each screen may, and preferably does, involve a screen frame 3 within which is arranged a screen section Il, beneath which there is a conveying section 5 having an outlet 6 to discharge the material upon the next lower-'most screen. As shown, the screens are arranged in superimposed relation in the unit, each screen being reversely inclined with respectv to the neXt lower screen and each screen discharging at its lowermost end onto the highest end olf the nei-rt lower screen.

i supporting strip 7 extends transverse the respective frame members l, said strip being` arranged at mid-height said frame iembers and being connected beyond the frame members by thru-bolts 8. These bolts constitute the point of suspension for the unit.

The screen suspending means is here shown 'as cables 9, which at an appropriate point in their lengths are connected to the respective ends of the thru-bolts 8 as at 10. ris illustrated, there are two cables for each end ot `the screen, though it is to be understood that the object sought is equally served by the use oit a greater number of such cables. The cables are designed to be connected at their upper and lower ends to a suitable fixture, as at ll, the connection being preferably thru the medium of a turn buckle l2 or similar element, whereby the tension ot the cables 9 may be adjusted at will.

@ne end of the screen structure, in direct horizontal alignment with the point of supiort, is provided with a contact bloolr 13 l'iaving a wear plate le, designed to receive the impact et an eccentric or other element, (not shown) .vhereby a series oit successive impact jars or blows may beiinparted to the support. Obviously the exact detail of the impact mechanism is not essential, and any accepted type et structure, which may impart the desired successive impacts to the structure. may be used.

ln Fig. 3, the invention is applied to a well known ttorm of multiple declr scalping screen, in which the screen members l5 are connected together at the usual inclination and deliver material from one screen to the nent. Tie supporting mechanism is in this type et screen similar to that preriously described, the scalping screen structure being supported on the single hori- .zontal line from the cables 9 at 16. Thelmpact members 13 and 14 ot the previously described form are applied to this type of screen, being olf course arranged in direct line with the support of the screen. A

lt will be obvious from the above construction that when the impact or disturbing torce applied to the unit is directed at right angles to the axis of support, and hence each point o'l support, each point of the entire screen unit, will move in a straight line in the same direction. rl`here is therefore produced a true horizontal rectilinear motion of eachy point of the screen unit. 'llie continued action is of course resultant trom the vibration oi the cable supports incident to the impact or disturbing torce, and it is apparent that these cables may be so tensioned as to control to a greater or less extent the period oi' vibration, and thus the frequency oit the screen movement. tlbviously the cables 9 should be tensioned above and below the supporting point lO to substantially the same tension, in order that the two rectilinear motions desired may be secured.

l/Vith this type or screen, the slope of the screens may be very flat, as by the high trequency rectilinear motion provided a substantially perfect feeding oif the material lengthwise the screen is secured, even with a screen of slight inclination. Equal motion is of course obtained on all screens,

and this together with the fact that the material which is oversize for each screen mesh must always pass over the Whole screen length betore'it is dischargedin sures the most accurate and perfect grading ci the material submitted to the screen.

lt will be noted that in the improved screen, all bearings and bearing surfaces are eliminated, the objectionable arc motion incident to the suspended or vertical spring type of the screen is avoided, and the high Yfrequency vibration insures the most etlective grading without the necessity of pronounced inclination of the respective screens.

Claims:

1.?A multiple deck screen, a tensioned supporting means arranged for unitary action' and a disturbing force for said means to cause the screen to move as a unit with a true rectilinear motion.

2. A multiple deck screen and a support tensioned for unitary vibration, the screen having a single point of connection with the support, and means .tor vibrating said support.

A multiple deck screen and a support tensioned for unitary vibration, the screen haring a single point of connection with the support, and means for exerting a disturbing :torce on the support in line with the point of connection.

e. A series of screens secured as a rigid unit, cables tensioned'ifor vibration, a single line ot suspension between said screen unit and cables, and means for vibrating the cables.

A. series of screens secured as a unit, cables tensioned tor vibration, connections between said screen unit and cables With said connections in the same plane, and means for exerting a disturbing torce on the cables in the same plane as the connections,

A multiple deck screen having the screens secured rigidly together as a unit, a series or cables supported at their respective ends and tensioned for vibration, and means for connecting the screen unit and cables with all said connecting means in the same horizontal plane transverse the cable support, and means for vibrating said cables, said means operating in the same horizontal plane as the connections.

7. A multiple deck screen having the screens secured rigidly together as a unit, a series of cables supported at their respective ends andV tensioned for vibration, and means for connecting the screen unit and cables with all said connecting means in the same horizontal plane transverse the cable support, means for vibrating said cables, said means operating in the same horizontal plane as the connections.

8. A series ot' spaced supports tensioned for vibration, a multiple deck screen unit connected to said supports and moving under the vibration of the supports in a true rectilinear plane, and means for vibrating the supports.

9, The combination of a sieve, and supporting elements secured under tension and responsive to a disturbing force to impart high frequency horizontal straight line motion to the sieve.

ln testimony whereof Iv atlix my signature.

HARRY H. KELLER. 

